There are four pistons, 16 valves (four per cylinder) and one platinum spark plug per cylinder with a coil-on-plug ignition system. It has an aluminum block and cylinder head, with a pair of chain-driven overhead cams. Consequently, they have to burn some type of high-octane racing fuel to minimize the risk of detonation.Ī SKYACTIV-G engine is pretty similar to any other engine. However, most racing engines are carbureted or port injected and do not have direct injection or Variable Valve Timing (VVT). With 112-octane racing gas, the compression ratio can be bumped up to 14 or 15:1. Leaded racing fuel rated at 107 pump octane can usually handle compression ratios in the 12:1 range. These engines are burning super high-octane racing gas or some type of alcohol (methanol or E85 ethanol) and have rich air/fuel mixtures. Many high-performance racing engines run compression ratios of 14:1 or higher, but not on ordinary pump gas. So how can Mazda SKYACTIV-G engines burn regular 87 octane gasoline with a static compression ratio of 13:1? It’s Mazda magic! If the fuel lacks enough octane to handle a higher compression ratio, it will detonate, knock and cause a loss of power - and possible engine damage, too! But as compression goes up, so do the octane requirements of the fuel to resist detonation.
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